I just gave one of these to my 4 year old son... He loves it, wears it all the time... which is what I wanted anyway!<br>We're going on a Jeep trail ride in southern Indiana in October and I wanted to make sure if he wondered off, he had a whistle on him. He also likes the magnifier for looking a bugs and other crawley creatures. I figure I'll teach him about the other items as he gets older. The space inside is right now used for a couple of rolled up band-aids... for ouies you know. The LED also works quite well for him at night... we hang it from the bed post so he can find it in the dark. One nice thing is he can't leave the light on over night, since you have to press and hold the button for the LED to light.<br>So far it's been a great gift for him... It took a while to get the idea of using the whistle "only when you need us"...(pass the tylenol)<br>Now I just hope he doesn't lose it before our trip.<br><br>I figure you can never start the "emergency preparedness" bug too young. (as my wife just rolls her eyes!)